Many of these tips originate from members of the I search discussion list (which is an amazing resource well worth the money).

This guy has an datebase ASP website and makes his dynamic content look static to the search engines using a custom 404 error pag build.

Additional ideas are a server side filter softwarehttp://www.smalig.com/url_rewrite-en.htm and URL rewriting software http://www.opcode.co.uk/components/rewrite.asp.

Here is the Apache Mod Rewrite page for you Apache people...

General tips to make a dynamic site get spidered
1.) Do not force feed the spider a cookie
2.) Use 3 or less variables
3.) Have each query string 10 or less digets
4.) Create a sitemap which links to many of the main database locations.
5.) Build up link popularity from a few quality inbound links. The PageRank (or link popularity in search engines other than Google) will make the spider more inclined to spider deep through your site.

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